Furnace



(NQ ModeL) 2 SheetsSheet 1. J. A. PRICE.

FURNACE.

Patented Dec. 1, 1885.;

l v I I lll llllmlll llllllI WITNESSES IN Eli/TOR 6b, C/Q

A A'ifm-nmm Nv PEYERS Fhalwljlhcgnphur, War-logic". D. C.

2 SheetS- Sheet. 2. J. A. PRICE.

(No Model.)

FURNACE.

No. 331,731. Patented Dec. 1, 1885.

W/T/VESSES dew. W

N. FEIERS. Phnifl-Lilhagnphor. Washingimm D. c.

UNITED STATES PATENT @rrr cr.

JOHN A. PRICE, OF SGRAXTON, PENNSYLVANIA.

FURNACE.

SPECZFICATION forming part of Letters Patent No. 331,731, dated December1, 1885.

Application filed July 15, 1884. Serial No. 137,756. (No model.)

To a/ZZ whom it may concern:

Be it known that 1, JOHN A. Peron, of Scranton, in the county ofLackawanna and State of Pennsylvania, have invented certain new anduseful Improvements in Furnaces; and I do hereby declare the followingto be a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, forming a part of this specification,and to the figures and letters of reference marked thereon.

My present invention relates more particularly to that class of furnacesin which Cllllll or fine coal is burned, and has for its object toincrease the efficiency and durability of such furnaces. In the burningof culm it has become the almost universal practice to force a blast ofcombined air and steam into the ashpit of the furnace, and thence upthrough the fire-bed, by means of a steam-injecting nozzle or blowerarranged within a suitable pipe or airway leading into the ash-pit insuch a manner as to cause the steam projected from it to draw in andconvey forward to the ash-pit a quantity of air for supportingcombustion.

Though various forms of steam-blowers have been employed, it has seemedimpossible to avoid the use of too great a quantity of steam for thevolume of air drawn in with it, and the result has been an imperfect oronly partial decomposition of the steam by the fire, owing to aninsufficient supply of oxygen furnished by the air, the undecomposedwatery element escaping with the carbonic acid and sulphur from the firecausing the rapid destruction of the stacks, if made of iron, and theformation of what are called sulphide deposits in the chimneys andfiues.

The highly beneficial effect of aproper quantity of steam in a culm-firebeing well known to me, the problem has been how to secure the presenceof such proper quantity, and at the same time a supply of air sufficientto insure the thorough decomposition of it. After practical tests I havefound that by causing steam under ordinary pressure to escape into orthrough the fire-bed, and by forcing independently of the steam soinjectedalarge volume of air into or through the fire-bed by anindependent fan-blower or other mechanical contrivance the desiredresult can be satisfactorily accomplished. My invention there fore hasfor its object to provide certain devices for overcoming the aboveobjections incident to the burning of culm; and it consists in certaindetails of construction and combinations of parts involved in thestructure of the furnace, all which will be hereinafter fully describedand claimed.

In the accompanying drawings, Figurel represents a\ top plan view ofafurnace constructed in accordance with my invention; Fig. 2, a verticalsection of the same, taken on the line m m, Fig. 1. Fig. 3 is asimilarview taken on the line 3/ 3/, Fig. 1. Figs. 4-and 5 are sectional viewsof different forms of the partition between the pairs of grate-sections.Fig. 6 is an edge view, and Fig. 7 a side view, of one of thefire-supporting arms or collars of the grate-sections.

Similar letters of reference in the several figures indicate like parts.

The letter A. indicates the wall of the furnace; B B B B the sections ofwhich the grate is composed. Each of these sections consists of a hollowshaft, 1), having its bearings in the walls of the furnace, and providedwith numerous small perforations, b, and having mounted upon it a seriesof fire-supporting arms or collars, b each constructed, as shown inFigs. 6, 7that is to say, with three fire-supporting surfaces, 12 b F, acentral perforation having the corrugations b, and the recess 1) foraccommodating a rib, a, on the shaft and the spacing-lugs b on itssides. These grate-sections are arranged in pairs, and the shafts ofeach pair are provided with suitable gears, G O, meshing into each otherso that both shafts will turn simultaneously when motion is imparted toeither of them. One of the shafts of each pair is preferably extendedthrough the wall of the furnace, and is provided with a squared portion,(1, for the application of a suitable turninghandle.

E represents a steanrpipe, preferably hinged or jointed at e to a pipe,F, conducted to the furnace-boiler or any other convenient source ofsteam-supply. This hinged pipe E is provided with a series of lateralnozzles, 6 which, when the said pipe is swung around, are adapted toenter and fit snugly within the open ends of the shafts b of thegrate-sections, as shown in Fig. l. The pipe F is provided with asuitable valve, f, for controlling the supply of steam. Leading into theash-pit S I of the furnace is a large air-pipe, G,. connected to asuitable fan-blower or other ordinary air-forcing contrivance. (Notshown.)

At each end of the fire-chamber of the furnace a tier of pipes, H, isarranged. These pipes are connected together by manifolds I at theirends, as shown in Fig. 3, and are in communication with the upper andlower parts of the furnace-boiler through the outlet and inlet pipes JK. Between the pairs of grate-sections a traverse bar, M, is arrangedand this bar supports a partition, N, consisting of a series of pipes,0, arranged as shown in Fig. 4, or in Fig. 5, and also connected attheir ends by manifolds, that are in turn connected to the boiler. Thepipes H, as well as the pipes O, are each provided with numerous studsor pins, 12, which are preferably screwed into them, so as to projectboth inside and outside, as shown in Figs. 5 and 6. These pins by theircontact with the fire become very hot, and serve to greatly increase theheating capacity of the pipes. They are preferably arranged so that thepins of one pipe will serve to support and properly space the pipe orpipes next above, as shown in Figs. 4 and 5.

When the furnace is in operation, the firebed is covered with culm, thecentral partition, N, between the pairs of grate-sections serving totrough the fire, thus affording a greater amount of fire-surface andpreventing the crusting and caking of the fire between the gratesections. So far as the function of troughing the fire is concerned anyother form of partition between the pairs of grate-sections would serveequally as well. The steam discharged through the perforations in thegrateshafts passes unimpeded between the spacing lugs on the arms orcollars, and thence into and through the firebed, while a large volumeof air is at the same time forced into the ash-pit under pressure andpasses up through the fire-bed, thus supplying the requisite amount ofoxygen to the fire, and by effecting the complete decomposition of thesteam preventing, to a great extent, the formation of the sulphidedeposits hereinbefore alluded to. The supply of steam can be regulatedat pleasure by the attendant.

When it is desired to rake the fire, it is accomplished by turning thegrate-sections, so as to present a new supporting-surface, the operationof turning causing the lower portion of the material on the grate to becut out and dumped into the ash-pit below. This may be done with thesteam off or not, as desired.

Instead of connecting the several tiers of water-pipes to thefurnace-boiler and taking the steam for combustion purposes from thelatter, said pipes may all be connected and used as a generator forsupplying such steam.

Having thus described my invention, Iclaim as new- 1. The combination,with the hollow shaft, perforated as shown, and fire-supporting rims orcollars mounted thereon, of means for blowing air into the ash-pit upthrough the grate and firebed, and means for blowingsteam into thefire-bed through the hollow shaft, substantially as described.

2. In a furnace, grate-sections composed of the hollow perforated shaftsand the fire-sup porting arms or collars mounted upon said, shafts, saidarms or collars having their spacing-lugs so arranged as to permitthefree outward passage of steam from the jetperforations in the shafts,substantially as described.

3. The combination,with the hollow revolv- 8o ing shafts having theribs,of the fire-supporting arms or collars having the corrugationsaround their central perforations and recesses for accommodating the ribon the shaft, whereby both the sections and shaft are prevented fromwarping.

4. The fire-supporting arms or collars provided with the spacing-lugshaving the openings between them, substantially as described.

5. The combination, with the hollow perforated shafts of the revolvinggrate-sections, of the steam-pipe having the nozzles fitting tight- 1ywithin the ends of said grateshafts, substantially as described.

6. The combination, of the pairs of grate 5 sections and the partitionseparating the same, whereby the fire is troughed, substantially asdescribed.

J A. PRICE. Witnesses:

A. S. STEWART, CHAS. It. BURR.

